Symbol-timing estimation in space-time coding systems based on orthogonal training sequences

Yik Chung Wu, S. C. Chan, Erchin Serpedin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Space-time coding has received considerable interest recently as a simple transmit diversity technique for improving the capacity and data rate of a channel without bandwidth expansion. Most research in space-time coding, however, assumes that the symbol timing at the receiver is perfectly known. In practice, this has to be estimated with high accuracy. In this paper, a new symbol-timing estimator for space-time coding systems is proposed. It improves the conventional algorithm of Naguib et al. such that accurate timing estimates can be obtained even if the over-sampling ratio is small. Analytical mean-square error (MSE) expressions are derived for the proposed estimator. Simulation and analytical results show that for a modest oversampling ratio (such as Q equal to four), the MSE of the proposed estimator is significantly smaller than that of the conventional algorithm. The effects of the number of transmit and receive antennas, the oversampling ratio, and the length of training sequence on the MSE are also examined.

Original languageEnglish
Pages (from-to)603-613
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume4
Issue number2
DOIs
Publication statusPublished - Mar 2005
Externally publishedYes

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Keywords

  • Approximated log-likelihood function
  • Space-time coding
  • Symbol-timing recovery
  • Training sequences

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Networks and Communications

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